43909066 has 4 divisors (see below), whose sum is σ = 65863602. Its totient is φ = 21954532.

The previous prime is 43909049. The next prime is 43909067. The reversal of 43909066 is 66090934.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 43178041 + 731025 = 6571^2 + 855^2 .

It is not an unprimeable number, because it can be changed into a prime (43909067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10977265 + ... + 10977268.

Almost surely, 2^43909066 is an apocalyptic number.

43909066 is a deficient number, since it is larger than the sum of its proper divisors (21954536).

43909066 is a wasteful number, since it uses less digits than its factorization.

43909066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21954535.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 43909066 is about 6626.3916274244. The cubic root of 43909066 is about 352.7914622413.

It can be divided in two parts, 4390 and 9066, that added together give a square (13456 = 116²).

The spelling of 43909066 in words is "forty-three million, nine hundred nine thousand, sixty-six".